package com.itheima;

public class TestLambda {
    public static void main(String[] args) {
        testD();
    }
    public static  void testD() {
        D d1 =new D(){
            @Override
            public  int max(int a, int b) {
                return Math.max(a, b);
            }
        };
        D d2 =(a,b)->a < b ? a : b;

        D d3 = Math::max;
        int max = d3.max(1,2);
        System.out.println(max);
    }



    public static  void testC(){
        //1.创建C接口的Lambda表达式对象
        C c1 = new C(){
            @Override
            public String show(String name) {
                return "name="+name;
            }
        };
        //2.创建C接口的lanmbda表达式对象
        C c2 = name -> "name=" + name;
        //3.//创建C接口的方法引用对象
        C c3 = TestLambda::show4;
        String result=("handsome Yang");
        System.out.println(result);

    }
    public static String show4(String name){
        return " name =" + name;
    }

    public static void testB() {
        B b1 = new B() {
            @Override
            public void show(String name) {
                System.out.println(name);
            }
        };
        //创建B接口的Lambda表达式对象
        B b2 = name -> System.out.println(name);
        //创建B接口的方法引用对象
        B b3 = System.out::println;
        b3.show("钟焮玥");
    }
    public static void testA() {
        //1.创建A接口的匿名内部类对象
        A a1 = new A() {
            @Override
            public void show(String name, int age) {
                System.out.println(name + ":" + age);
            }
        };
        //2.将匿名内部类对象改成Lambda表达式
        A a2 = (name, age) -> System.out.println(name + ":" + age);
        a2.show("张三", 18);
        //3.使用方法引用替换Lambda表达式
        A a3 = TestLambda::show2;
        a3.show("李四", 20);
        //4.使用方法引用替换Lambda表达式（成员方法）
        TestLambda testLambda=new TestLambda();
        A a4 = testLambda::show3;
        a4.show("王五",35);

    }

    //定义一个成员方法，故意让返回值和形参和A接口中的方法一致
    public static void show2(String name, int age) {
        System.out.println("show2:" + name + "," + age);
    }

    public void show3(String name, int age) {
        System.out.println("show2:" + name + "," + age);
    }
}

